A picture hangs in the office of Walmart Inc. Chief Executive Doug McMillon showing company trucks rolling into New Orleans after Hurricane Katrina, an indication of the retailer’s pride in quickly restocking stores during the toughest of times.

Walmart is being tested like never before by a coronavirus pandemic that has shut down much of the nation, put 10% of its workforce on leave and led to at least 18 deaths at the company. Managing the health of workers and shoppers, reassuring local officials, and keeping stores and…

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